Dissouted bedrock
BEDROCK ~@P3X~
Phacops
In their headwaters, where the gradient is steep, most rivers cut into bedrock. These streams typically transport course particles that actively abrade the bedrock channel.
area with granite bedrock
parralel grooves
Limestone or dolostone, most likely, because of its chemical reactivity and dissolution by naturally acidic rainwater and groundwater.
sedimentary bedrock
BEDROCK ~@P3X~
nothing
sedimentary bedrock
Phacops
In their headwaters, where the gradient is steep, most rivers cut into bedrock. These streams typically transport course particles that actively abrade the bedrock channel.
area with granite bedrock
Yes, it was most likely carved out of the bedrock with stone hammers and copper chisels.
parralel grooves
shale and sandstone
The processes most likely formed a burial and compaction which the shale bedrock is found near Ithaca, New York.